Australian Mortgage Calculator 2026 | Repayments, Rates & Stamp Duty
Calculate home loan repayments, extra repayments interest savings, 100% offset account benefits, Keystart WA eligibility ($860k property price cap), and state transfer duty concessions across Australia.
How Australian Mortgage Repayments Are Calculated
Mortgage repayments in Australia use standard principal and interest amortization schedules with daily interest accrual and monthly compounding:
M = P · [ r(1 + r)ⁿ ] / [ (1 + r)ⁿ - 1 ]
- M: Monthly repayment amount
- P: Loan principal (Property price minus cash deposit)
- r: Monthly interest rate (Annual rate divided by 12)
- n: Total loan repayment periods (Loan term in years multiplied by 12)
Key Mortgage Calculators & Tools
- Mortgage Repayment Calculator: Model weekly, fortnightly, and monthly repayments across variable and fixed interest rates.
- Extra Repayments Calculator: See how additional monthly or lump-sum payments reduce total interest and shorten your loan term.
- Offset Savings Calculator: Calculate the tax-free interest savings generated by linked 100% offset transaction accounts.
- Keystart WA Calculator: Check eligibility for Western Australia's 2% deposit home loan scheme under the $860,000 price limit.
- LMI Estimator: Estimate Lenders Mortgage Insurance premiums for loans with less than a 20% deposit (LVR > 80%).
- Stamp Duty Calculator: Calculate state property transfer duty, first home buyer exemptions, and concession thresholds across NSW, VIC, QLD, WA, SA, TAS, ACT, and NT.
- Islamic Home Finance Calculator: Model Sharia-compliant co-ownership (Diminishing Musharakah) and lease-to-own (Ijarah) structures without interest (Riba).
State First Home Buyer Stamp Duty Thresholds (2026)
- New South Wales (NSW): Full stamp duty exemption up to $800,000; concessions up to $1,000,000.
- Victoria (VIC): Full stamp duty exemption up to $600,000; concessions up to $750,000.
- Queensland (QLD): Full stamp duty exemption up to $700,000; concessions up to $800,000.
- Western Australia (WA): Full stamp duty exemption up to $450,000; concessions up to $600,000.
Regulatory Disclosure & Safe Harbor (ASIC RG 203)
mymortgagecalculator.com.au provides educational calculation tools and does not hold an Australian Financial Services Licence (AFSL) or Australian Credit Licence (ACL). All calculations are mathematical estimates. Always consult a licensed mortgage broker or financial advisor before entering a credit contract.